Five System Barriers to Achieving Ultrasafe Health Care

Figure 2. A 2-tiered system of medicine may result from the distinction between a limited number of clinical domains that
can achieve ultrasafety and sectors in which a certain level of risk is inherent. HRO = high-reliability organization.
A strategic view of safety in health care.
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Ann Intern Med
May 3, 2005
vol. 142
no. 9
756-764